Decode in the Browser
Paste a JWT access or ID token to extract the header and payload claims. All decoding runs locally and does not transmit data.
JWT Decoder
Decode JWT tokens in your browser. Inspect header, payload, and verify signature status without sharing secrets.
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Browser basedNo signupCopy-ready output
Paste JWT token
Output
Generated output will appear here.
Inspect Header and Payload
See the token type, signing algorithm, key ID in the header, and the full claims payload including issuer, subject, audience, and expiration.
Signature Status Check
The decoder highlights whether the token has a valid structure with three dot-separated segments. Signature verification requires a secret key and is not performed in this browser tool.
Frequently Asked Questions
Does the JWT decoder verify the signature?
No. This tool decodes the header and payload but does not verify the cryptographic signature because it does not have access to the signing key or secret.
Is my JWT token sent anywhere?
No. All decoding happens in the browser. The token stays on your device and is never transmitted over the network.